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High Energy ep Scattering: Higgs and FCC

High Energy ep Scattering: Higgs and FCC. Monica D’Onofrio University of Liverpool (on behalf of many …). DIS 2014, Warsaw April 30 th 2014. Outline. The idea of an e-p collider at CERN, the LHeC , proposed in 2005, has been developed in the last years .

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High Energy ep Scattering: Higgs and FCC

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  1. High Energy ep Scattering: Higgs and FCC Monica D’Onofrio University of Liverpool (on behalf of many…) DIS 2014, Warsaw April 30th 2014

  2. Outline Monica D'Onofrio, DIS2014, Warsaw • The idea of an e-p collider at CERN, the LHeC, proposed in 2005, hasbeendeveloped in the last years. • The FCC-he: arealisticopportunity for energy frontier DIS  3 order of magnitude higher lumiwrt HERA; huge step in energy (Q2,1/x). • In this talk: • Prospects for HiggsmeasurementsatLHeCand FCC-he • Future Circular Collider (FCC) complexview • Highlightsof physicsprogramme (focus on e-p)

  3. Othercontributions Monica D'Onofrio, DIS2014, Warsaw In thisConference, othertalks on LHeC and/or FCC-he physicshighlights: • LHeCaccelerator Development • Emilia CRUZ ALANIZ • Electroweak and top physics at energy frontier DIS • Christian SCHWANENBERGER • Parton distributions in the proton from the LHeC • Voica Ana Maria RADESCU • eAcollisions at the LHeC and FCC • Guilherme TEIXEIRA DE ALMEIDA MILHANO • LHeC detector design and simulation • Paul NEWMAN

  4. e-p at HERA .. and beyond The LHeC, proposed in 2005, hasbeendeveloped in the last years: http://cern.ch/LHeC Tevatron/HERA/LEP  HL-LHC/LHeC/(ILC?) (fermiscale) (Terascale) (or, the complimentarity pattern) Monica D'Onofrio, DIS2014, Warsaw • At HERA, extensivetests of QCD, measurements of aS and base for PDF fits in x rangerelevant for hadroncolliders • Butalso: • New limits for leptoquarks, excitedelectrons and neutrinos, quark substructure and compositness, RPV SUSY etc.

  5. LHeC: Conceptual Design Report (July 2012) and more Monica D'Onofrio, DIS2014, Warsaw • 630 pagessummarising 5 yearsof studiescommissioned by CERN, ECFA and NuPECC • About 200 participants, 69 institutes • Furtherupdates • ‘A Large Hadron Electron Collider at CERN’ arXiV:1211.4831 • ‘On the relation of the LHeC and the LHC’ arXiV:1211.5102 • ‘The Large Hadron Electron Collider’arXiV:1305.2090 • ‘DigDeeper’ Nature Physics 9 (2013) 448 • Regular workshops and presentations in Conferences

  6. Coordinationgroup for future DIS at CERN The IAC was invited in 12/13 by the DG with the following Guido Altarelli (Rome) Sergio Bertolucci (CERN) Frederick Bordry (CERN) Stan Brodsky (SLAC) Hesheng Chen (IHEP Beijing) Andrew Hutton (Jefferson Lab) Young-Kee Kim (Chicago) Victor A Matveev (JINR Dubna) Shin-IchiKurokawa (Tsukuba) Leandro Nisati (Rome) Leonid Rivkin (Lausanne) HerwigSchopper (CERN) – Chair JurgenSchukraft (CERN) AchilleStocchi (LAL Orsay) John Womersley () *) Mandate 2014-2017 Advice to the LHeC Coordination Group and the CERN directorate by following the development of options of an ep/eA collider at the LHC and at FCC, especially with: Provision of scientific and technical direction for the physics potential of the ep/eAcollider, both at LHC and at FCC, as a function of the machine parameters and of a realistic detector design, as well as for the design and possible approval of an ERL test facility at CERN. Assistance in building the international case for the accelerator and detector developments as well as guidance to the resource, infrastructure and science policy aspects of the ep/eA collider. See also Panel discussion at the recent LHeC workshop (Chavannes, 20-21 Jan 2014) H. Schopper slides: https://indico.cern.ch/event/278903/contribution/55 *) IAC Composition February 2014+ Oliver Brüning Max Klein ex officio Monica D'Onofrio, DIS2014, Warsaw Toward a concrete planning: International Advisory Committee

  7. The LHeC LHeC: Ee=60 GeV, √s = 1.3 TeV Designed to exploit intense hadronbeamsin high luminosityphase of LHC running from mid 2020s:  Use 7 TeVprotons  Addan electron beamto the LHC Monica D'Onofrio, DIS2014, Warsaw Uniqueopportunity to take lepton-hadronphysics to the TeV centre-of-mass scale at high luminosity

  8. The LHeC ‘facility’ e±beamoptions: Ring-Ring and Linac-Ring RR LHeC: new ring in LHC tunnel, with bypasses around experiments LR LHeC: recirculating linac with energy recovery baseline configuration Monica D'Onofrio, DIS2014, Warsaw

  9. The LHeC baseline parameters e-p and e+p collisions (possibly with similar luminosity)  60 GeV (ele), 7 TeVproton e-/e+ polarization • Operations simultaneous with HL-LHC pp physics Monica D'Onofrio, DIS2014, Warsaw • ep Lumi: 1033 (1034)** cm-2 s-1(**: according to recentstudies) • 10-100 fb-1 per year • 100 fb-1 – 1 ab-1total • eD and eAcollisionsintegral part of the programme • e-nucleonLumi estimates 1031 (1032) cm-2 s-1 for eD (ePb)

  10. LHeCPhysics Monica D'Onofrio, DIS2014, Warsaw • Richphysicsprogram for e-q physicsatTeVenergies: • Precision QCD,EWK physics • Higgsmeasurementsand searches for BSM • Complimentarities to LHC physicsprogram and boostingitsprecision (eg PDF at high x)

  11. HiggsmeasurementsatLHeC b • 200 fb for CC, 25 fb for NC (polarized e beam) • Lessthan LHC BUT lessdifficult • Comparable to ILC • In otherwords, GREAT POTENTIAL! Monica D'Onofrio, DIS2014, Warsaw

  12. Status of the art on Higgs: ATLAS example Monica D'Onofrio, DIS2014, Warsaw

  13. Higgs in ppHL-LHC and PDF uncertainties Monica D'Onofrio, DIS2014, Warsaw Studies for High Luminosity LHC shows that PDF uncertaintieswill be a limitingfactor for severalchannelsat the HL-LHC With LHeC: hugeimprovements in PDFs and precision in aS full exploitation of LHC data for Higgsphysics Similarconclusion and relations expected for FCC-he  FCC-hh

  14. Higgs in ppHL-LHC and PDF uncertainties aS= underlying parameter relevant for unc. (0.005  10%) @ LHeC: measure to permilleaccuracy (0.0002)  precisionfrom LHeC can add a verysignificantconstraint on the Higgsmass butalso: Studyunification of couplings Monica D'Onofrio, DIS2014, Warsaw Studies for High Luminosity LHC shows that PDF uncertaintieswill be a limitingfactor for severalchannelsat the HL-LHC With LHeC: hugeimprovements in PDFs and precision in aS full exploitation of LHC data for Higgsphysics Similarconclusion and relations expected for FCC-he  FCC-hh

  15. Study of Higgsproduction at e-p Monica D'Onofrio, DIS2014, Warsaw WWH and ZZH vertices can be probeduniquely and simultaneously Energy RecoveryLinac: high electron polarization, 80-90%  lead to twice the CC rates! NLO QCD corrections in DIS small wrt to pp For Higgs: shapedistortions of kinematicdistributions up to 20% due to NLO QCD QED corrections: up to 5% [i.e.: arXiV:1001.3789]

  16. Higgs Production rate atLHeC CC and NC Total event rate for 10 fb-1 = 1 month of high luminosityrunningusing 60 GeV LINAC 1100 events H  bb ; 140 events H tt; 60 events H  cc Monica D'Onofrio, DIS2014, Warsaw

  17. Analysis framework Courtesy of U.Klein Monica D'Onofrio, DIS2014, Warsaw

  18. Example from CDR: Generatedsamples Monica D'Onofrio, DIS2014, Warsaw

  19. H bb @ LHeC: CDR studies(mH=120 GeV) • Forward jet tagging • h jet > 2 (lowestetajet, anti-btagged) For 10 fb-1, unpolarizedbeam and Ee=150 GeV, reachS/√B ~ O(10) Monica D'Onofrio, DIS2014, Warsaw • NC DIS rejection: • Exclude electron-tagged e • ETMiss>20 GeV, Njet(pT>20 GeV)≥3 • ET,total>100 GeV • yJB>0.9, Q2JB>400 GeV2 • B-tagging: • Assume flatefficiency≈ 60% (10% c-tag, 1% mistag rate) • N b-jet ≥ 2 (20 GeVthreshold) • 90<M(higgs)<120 GeV • Single top rejection (>40% of totalremaining background): • Mjjj,top>250 GeV • Mjj,W>130 GeV

  20. H bb @ LHeC: mostrecentresults Monica D'Onofrio, DIS2014, Warsaw • Use similar approach, cut and count analysis: • Veryclearsignal! • LINAC with high epolarization of about 90%  around 10KHiggs! • AllowHbbcouplingmeasurements with 1% statisticalprecision (1 ab-1) • Hccbarchannelalso under study • Lowbutstill ‘taggable’ charm-jets Cleanenvironmentwrtpp

  21. H bbar and ccbarkinematic U.Klein Monica D'Onofrio, DIS2014, Warsaw

  22. Higgs tau tau Reduciblethanks to Hard cutsthat can be applied on tau pT and di-tau mass Monica D'Onofrio, DIS2014, Warsaw • Feasibilitystudies on going • Reasonable cross sections (expect 10% of Hbbbar) • Promising channels: • mu+ tau_had • mu- tau_had • tau_hadtau_had • e+ mu • The main background will come from di-tau production: • Next step is to look into the prospects of fakes, although if these channels are possible at the LHC  alsopossible at the LHeC!

  23. CP properties of the Higgs Monica D'Onofrio, DIS2014, Warsaw • At the LHeC: uniqueaccess to HWW  searches for BSM exploring CP properties of HVV, since CP-even and CP-oddstateswould be differentlymodified by new physics • Analysis of LHC data indicate consistency with the SM 0+ hypothesis. However, we need to understand if there is a mixture of physics beyond the SM, even within the 0+ hypothesis. Studyshapechanges in DIS normalised CC Higgsbbbar x-sect VS Df(MET-forward jet)

  24. Beyond the LHeC: the FCC-he Monica D'Onofrio, DIS2014, Warsaw

  25. Possibleview of FCC complex FCC-ee(80-100 km, e+e-, up to ~350 GeV c.m.) PSB PS (0.6 km) LHC (26.7 km) SPS (6.9 km) FCC-hh (pp, up to 100 TeVc.m.) HL-LHC LHeC FCC-he complimentary to FCC-hh, with no disruption for itwhilerunning! LHeCcould also be FCC-eeinjector ! LHeC/FCC-he: e±(60-175 GeV) – p (7and/or 50 TeV) collisions ≥50 years e+e-, pp, e±p/Aphysics at highest energies! F. Zimmerman (Chavannes, Jan.2014) Monica D'Onofrio, DIS2014, Warsaw

  26. From the LHeC to the FCC-he Tevatron/HERA/LEP  HL-LHC/LHeC/(ILC?)  FLHC/FHeC/FLC (fermiscale) (Terascale) (Multi-Terascale) Lepton-Proton ScatteringFacilities Realisticopportunity for energy frontier DIS  3-4 order of magnitude higher lumiwrt HERA; huge step in energy (Q2,1/x) Monica D'Onofrio, DIS2014, Warsaw

  27. FCC-he preliminaryparameters e-energy = 60, 120 GeV up to 175 GeV (e+ option open) p energy = 50 TeV CM energy [TeV] = 3.5 (60 GeV e), 4.9 (120 GeV e) IP spot size determined by p Energy recoveryis 60 GeV Ring-Ring might go up to 175 GeV Monica D'Onofrio, DIS2014, Warsaw

  28. DIS: from HERA to FCC-he Low x: Q2min ~ Ee2 keep 60 GeVelectrons Large x: needveryfwdtracking (@ 1 degree) High Q2 FCC-he Rutherford backscattering of dozens of TeV e- energy LHeC FCC-he E(p) = 50000 GeV E(e) = 60GeV FCC-he E(p) = 50000 GeV E(e) = 175 GeV FCC-he ----------- • 179o • @180 GeV LHeC HERA  ϑh=1o Low x .. very low x requires not the maximum of Ee HERA x Monica D'Onofrio, DIS2014, Warsaw

  29. Detector layout (More in P.Newman talk) FCC-he detector requirementsverysimilar! Monica D'Onofrio, DIS2014, Warsaw • LHeCrequirements: • High acceptancesilicontrackingsystem • Liquid Argon ElectromagneticCalorimeter • Iron-ScintillatorHadronicCalorimeter • Forward-Backwardasymmetry in energydepositedhence in calorimetersgeometry and technology: Si/W, Si/Cu • Detectors design: • 14m x 9m (e.g.: CMS 21m x 15m; ATLAS 45m x 25m) • e/gtaggers ZDC, protonspectrometerintegral to design from outsetsystemprovidingtagging • At -62 m(e), 100m(g,LR), -22.4m(g,RR),+100m(n),+420m(p) • Magnets: • Solenoid (3.5 T) + dualdipole 0.3 T • Might be embeddedinto EMC LarCryogenic System • Performance and impact of dead material in EMC-HAC sections under studies

  30. FCC-he detector layout Monica D'Onofrio, DIS2014, Warsaw LongerthanLHeCin p direction (x 2 for calorimeters to containshowers) Same or slightlylonger in electron direction (about 1.3 for 120 GeV)

  31. PhysicsHighlights • PDF fits, measurements of aSand impact on higgs/BSM • Higgsmeasurements(Hbbbaror ccbar, HHH couplings) • New Physics (CI, LQ, RPV SUSY) • EWK measurements (sin2θW) Monica D'Onofrio, DIS2014, Warsaw

  32. PDF fits @ 100 TeV The LHC will provide further constraints, but a new level of precision in determination of PDFs can only be achieved with the e-p gg qqbar qq x ≈ 0.5 Monica D'Onofrio, DIS2014, Warsaw • Current status  Need to know the PDFs much better than now at low and high x • E.g.: for QCD development, q-g dynamics, Higgs measurements and searches

  33. PDF fits Examplegluon PDF at the LHeC (blue band): < 5% at x=10-6 and x=0.5 Low x high x SeealsoV. Radescu’s talk Monica D'Onofrio, DIS2014, Warsaw • Current status  Need to know the PDFs much better than now at low and high x • E.g.: for QCD development, q-g dynamics, Higgs measurements and searches

  34. Impact of high-x PDF on HL-LHC/FCC-hh LHeCprospects Similarconclusions for other non-resonant BSM signalsinvolving high x partons (e.g. contactinteractionssignal in DrellYan) Monica D'Onofrio, DIS2014, Warsaw • Searches near HL-LHC / FCC-hh kinematic boundary may ultimately be limited by knowledge of PDFs (especially gluon at x  1) • Example: gluinoproduction at HL LHC  Dependencyon discoverypotentialand exclusionlimitsat 300 and 3000 /fb for 14 TeVc.o.m.

  35. Higgs production rate: LHeC FCC-he E(e)=60 GeV E(e)=120 GeV Monica D'Onofrio, DIS2014, Warsaw Chargedcurrentep: cross sectionmuchlargerthane+e-

  36. Higgs production rate: LHeC FCC-he (II) Monica D'Onofrio, DIS2014, Warsaw

  37. Higgs production rate: LHeC FCC-he (III) Extremely high precisionmeasurements of Hbb Can alsoexplore H  HH !! Monica D'Onofrio, DIS2014, Warsaw

  38. Double higgsproduction @ 50 TeV Cross-sections for CC HH->4b (branching ratios included) for unpolarized electron beam Monica D'Onofrio, DIS2014, Warsaw Electron-proton collisions offer the advantage of reduced QCD backgrounds and negligible pile-up with the possibility of using the 4b final state (s×BR(HH4b)=0.08 fb).

  39. First feasibilitystudies Results assume 70% b-tagging efficiency, 0.1 (0.01) fake rates for c (light) jets Plots for Ee=60 GeV (very similar for 120,150 GeV) Scattered quark is more forward in signal  good discriminant! Despite large beam energy imbalance, b-jets are relatively central Monica D'Onofrio, DIS2014, Warsaw Cross-sections for CC backgrounds in fbfor Ee=60, 120,150 GeV

  40. Httbar Monica D'Onofrio, DIS2014, Warsaw • Can alsoexploreHttbar: 3bjets + W in final state! • Total cross section: 0.7 fb • Fiducial cross section: 0.2 fb, considering: • pT(b), pT(j)> 20 GeV • DR (j,b) > 0.4 • Eta_jet < 5 • Eta_bjet< 3

  41. NP in inclusive DIS at high Q2 Observedasmodification of the Q2 dependence all information in ds/dQ2 Alsoparametrizedasformfactors : Compositenessscale Monica D'Onofrio, DIS2014, Warsaw • At these small scales new phenomena not directly detectable may become observable as deviations from the SM predictions. • A convenient tool: effective four-fermion contact interaction • Radiusfor composite fermions: • Proportional to scale • reachwellbelow10-19(10-20) m (LHeC/FHeC) • Complimentary to LHC/FCC-hh(notdirectlyprobing EWK Radius)

  42. Contactinteractions (eeqq) Similarto LHC ATLAS and CMS constraints on eeqq CI (expected up to 30-40 TeVatc.o.m. 14 TeV LHC) Monica D'Onofrio, DIS2014, Warsaw New currents or heavybosonsmay produce indirecteffect via new particleexchangeinterfering with g/Z fields. Reach for L (CI eeqq): 40-65 TeV with 100 fb-1 of data depending on the model

  43. Reach for CI (eeqq) atFCC-he - 300 TeV 150 FCC-he FCC-he VV LL 200 100  LHeC  LHeC HERA HERA 2x1 ab-1 2x1 ab-1 Verypreliminaryscaling Reach about O(100) TeV, expected to be competitive with FHC Monica D'Onofrio, DIS2014, Warsaw

  44. Lepto-Quark FCC-he (50 TeV x 60 GeV) s ≈ l LHeC FCC-he (50 TeV x 120 GeV) Preliminary studies in progress (G.Azuelos) Assume 20 fb-1 for FCC) Monica D'Onofrio, DIS2014, Warsaw • High Q2 e-p collider competitive with p-p collider for NP modelswhereinitial state leptonis an advantage • By providingboth B and L in the initial state, idealto study the properties of new particleswith couplings to an e-q pair • Probe single particleprod. First gen. LQ • Can probe up to 4 TeV LQ atFCC-he • IfLQ are observed in p-p  in e-p can measurefermionnumber(red) and flavorstructure (blue)

  45. R-parityviolating SUSY Relevant for e-p: squark production (e.g. stop):  l131’ couplings relevant in e-p production, several can be explored for decays Examplefor LHeC: 1107.4461.pdf Assume decay via m+b Sensitivity for high stop mass with 50-100 fb-1 (e-) dbar Many more decaymodes (RPV or RPC) hard atLHC/FCChhcan be explored(sbottominvestigatedaswell) Monica D'Onofrio, DIS2014, Warsaw • Several final states to explore: • LSP no longer stable • > 700 possibilities + bilinear couplings! Examples:

  46. Electroweak Physics in ep [sin2θW] Seealso C. Schwanenberger’s talk EWK precisionmeasurementsrelevant for NP Monica D'Onofrio, DIS2014, Warsaw

  47. Electroweak Physics in ep (II) Polarisation Asymmetry A-(Q) NC-to-CC Ratio R- for P=±0.8 Measure weak mixing angle redundantly with very high precision of about 0.0001 as a function of the scale. 1% δMtop is about δ = 0.0001 PDF uncertainty comes in at second order and ep provides very precise PDFs LHeC Monica D'Onofrio, DIS2014, Warsaw

  48. Scale dependence of sin2θW • LHeC/FCC-he • Energy range 10-2000 GeV • Sensitivity from: • ALRat high Q2 • sNC/sCCatlower Q2 Preliminary sketch Monica D'Onofrio, DIS2014, Warsaw

  49. Summary • LHeC design matured over past 6 years; CDR published in 2012 and more publications followed up • Great physicspotential, complementary to HL-LHC • Veryexcitingpossibilities for Higgsmeasurements, competitive with pp ! • LHeCcompatible with long-term strategy (FCC) • FCC-he : 60...175 GeVE_e x 50 TeV • Richphysicsprogram under development (in parallel with consolidationstudies for LHeC) • E.g. double higgsproduction  The FCC-he is a great opportunity for precision DIS, BMS and Higgs genuinely complementary also to FCC-hh and FCC-ee Monica D'Onofrio, DIS2014, Warsaw

  50. Back-up

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